Fix Unicode test link.

[Menturan]

Description

Old link redirected to https which gave an error with curl.

Motivation and Context

See above.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Tested in Linux Mint 18.3.

• [ ] I have tested using MacOS
• [x] I have tested using Linux

Checklist:

• [x] I have checked that no other PR duplicates mine
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have updated the tests accordingly.

[matchai]

Nice find @Menturan! Thank you for your contribution. 😄

[matchai]

@all-contributors please add @Menturan for bug

[allcontributors[bot]]

@matchai

I've put up a pull request to add @Menturan! :tada:

[matchai]

:tada: This PR is included in version 2.4.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: